CN110655293A - A kind of frame composite structure earthworm reactor and method for treating sludge - Google Patents

Abstract

The invention discloses an earthworm reactor with a frame composite structure, which comprises a main body frame and a multi-layer reactor box body positioned in the main body frame; the bottom of each layer of the main body framework is provided with a bottom plate, and the reactor box body is movably arranged on the bottom plate of each layer; an aeration pipe and a filtrate collecting pipe are arranged in the reactor box body of each layer; one side of the main body frame is respectively provided with an aeration air supply pipe connected with each layer of aeration pipe and a filtrate collecting pipe connected with each layer of filtrate collecting pipe; the aeration air supply pipe is connected to an external aeration device, and the bottom of the filtrate concentration pipe is connected with an external liquid storage tank. The reactor has short sludge treatment period which can be shortened to 3-5 days, and the earthworms can be thrown once to continuously treat 20 batches or more of sludge, thereby saving a large amount of manpower and material resources. Meanwhile, the collection of the wormcast, the earthworm filtrate, finished earthworms and other products is more convenient, and the problems of odor diffusion and mosquito breeding in the sludge treatment process by the earthworms can be effectively avoided.

Description

A kind of frame composite structure earthworm reactor and method for treating sludge

technical field

The invention relates to a method for sludge treatment and resource utilization, in particular to a frame composite structure earthworm reactor and a method for treating sludge.

Background technique

With the development of social economy and urbanization, the number of urban sewage treatment plants is increasing, and the subsequent sludge treatment and disposal problems have become the focus of attention. The sludge has a high water content and is parasitized by various bacteria, viruses and other harmful microorganisms; at the same time, the sludge is also concentrated with heavy metal compounds such as zinc, lead, cadmium, copper, etc., and the complex and variability of the sludge structure makes sludge disposal. Dealing with problems is trickier. At present, the main sludge disposal technologies at home and abroad include landfill, incineration, composting, and bioremediation. These treatment technologies have their own characteristics, but most of them have problems of secondary pollution and cost constraints.

With the development of technology, the bioremediation method represented by earthworm treatment technology has become an environmentally friendly and effective treatment method. The use of earthworm treatment technology to treat sludge can not only inactivate various bacteria and viruses, passivate and solidify heavy metal compounds, eliminate the toxic and harmful properties of sludge, but also retain nutrients in sludge to the greatest extent. Under the action of digestion and metabolism, high-efficiency bio-organic fertilizer vermicompost is formed. It has high economic and environmental benefits. However, the traditional earthworm treatment technology generally has shortcomings such as being affected by temperature and climate, large area, low treatment efficiency, long treatment period, large labor consumption, and easy to expand the scope of pollution during sludge transportation, which makes the large-scale earthworm treatment technology. applications have been limited.

SUMMARY OF THE INVENTION

Purpose of the invention: The present invention combines the physical and chemical properties of sludge, the characteristics of earthworm treatment and the physiological habit of earthworms for sludge treatment, and provides a frame composite structure earthworm reactor, so as to solve the problems in the prior art that the earthworm treatment cycle is long and occupies a large amount of time. Problems such as large area, mosquito breeding and odor.

In order to solve the above technical problems, the present invention discloses a frame composite structure earthworm reactor, which includes a main frame and a multi-layer reactor box located in the main frame; the bottom of each layer of the main frame is provided with a bottom plate, and the reaction The box body is movably arranged on the bottom plate of each layer, and can be drawn out from the main frame;

There are aeration pipes and filtrate collection pipes in the reactor box of each layer; one side of the main frame is respectively provided with an aeration supply pipe connected with the aeration pipes of each layer, and a filtrate concentration pipe connected with the filtrate collection pipes of each layer. The aeration air supply pipe is connected to an external aeration device, and the bottom of the filtrate concentration pipe is connected to an external liquid storage tank to collect the earthworm filtrate generated during the treatment process.

Specifically, the reactor box includes a main box with an open top, and an isolation filter layer, a sand supplement layer, an earthworm habitat layer, a nutrient supplement layer, and a treatment sludge layer respectively laid in the main box from bottom to top. Preferably, the aeration pipes of each layer of the reactor box are all located in the earthworm habitat layer, and one end of the aeration pipe located on the outside of the main box is connected with the aeration supply pipe; the aeration pipe is located in the main box. The air holes are used to control the temperature, humidity, oxygen content and other conditions in the box through aeration; the filtrate collection pipes of each layer are located on the outer wall of the bottom of the isolation filter layer.

Further, the main box located on both sides of the sludge layer is a baffle that can slide up and down, and the inner walls located on both sides of the main box below the main box are provided with corresponding slide rails, and the baffles slide up and down along the direction of the slide rails; The bottom of the slide rail is sealed, and the outer walls on both sides of the main box are provided with screws for fixing the baffle; after the screws are tightened, they pass through the outer wall of the main box to contact the baffle in the slide rail and fix the baffle; After one processing cycle, the baffle is lowered to complete the reclaiming process, and the baffle is raised to complete the feeding process.

Further, an isolation plate with holes is arranged between the nutrient supplement layer and the treatment sludge layer, the diameter of the holes is 1.5-4.5cm, and the number of holes is 25-85, and the isolation plate is directly processed during the reclaiming process. The finished sludge is scraped out, and the isolation plate has holes to facilitate the movement of earthworms up and down.

Specifically, the height of the main box is 15-25 cm, the length is 30-70 cm, and the width is 20-60 cm;

The isolation filter layer is filled with crushed straw with a thickness of 0.5-2 cm; the sand supplementary layer is filled with fine sand with a thickness of 0.5-1.5 cm, and the fineness modulus is 2.2-1.6; the earthworm habitat layer is filled with The vermicompost with a thickness of 5-9 cm; the nutrient supplement layer is filled with decomposed cow dung and perishable garbage with a thickness of 0.5-2 cm; the treated sludge layer is used for adding sludge to be treated, and the thickness is laid 3-10 cm.

Specifically, the main frame is 100-250 cm high, 32-72 cm long, and 22-62 cm wide, divided into 5-20 layers, each layer carries a reactor box, and each layer is 18-30 cm high .

The present invention further provides a method for treating sludge using the above-mentioned frame composite structure earthworm reactor, comprising the following steps:

(1) Put 1.2-4.5kg of adult ringed worms in the earthworm habitat bed in each reactor box, and place them in the dark at 18-28℃ for 2-7 days. During the period, put them into the reactor box every day Water spray to keep the water content of the earthworm habitat at 60-80 wt%;

(2) Add conditioner to the sludge in the sludge storage tank, and then put in the bacterial solution to mix it evenly for 12-48 hours;

(3) taking the decomposed sludge in step (2) and evenly spreading it into the earthworm habitat bed in each reactor box after the cultivation in step (1);

(4) Put each reactor box into the main frame, and connect the aeration air supply pipe and the filtrate concentration pipe in turn; open the aeration to carry out a cycle of sludge treatment;

(5) After all the sludge in each reactor box is converted into vermicompost, take out each reactor box, scrape and collect the treated sludge and surface earthworms in each reactor box, and supplement the sewage to be treated. Sludge for the next cycle of sludge treatment;

(6) Scraping and collecting the processed product through the screen to separate the vermicompost and the finished worms. Part of the separated vermicompost is reused as a new conditioner, and the remaining vermicompost and finished worms are stored as products in a centralized manner.

Further, because the earthworms in the reactor are prone to inbreeding in the reactor and cause the degradation of the earthworms, the step (7) is also included: after 20 cycles of continuous treatment, 0.1-0.35 kg of rejuvenated earthworms are added to each reactor box, After the rejuvenation was added, earthworms provided foreign genes for the earthworm population in the reactor and maintained the vitality of the earthworm population in the reactor.

Specifically, in step (2), the sludge is municipal sludge with a moisture content of 75-90 wt%; the conditioning agent is a mixture of crushed straw and vermicompost, and the amount of crushed straw added is 3% of the sludge mass. -7%, the vermicompost is the vermicompost obtained in step (6), the moisture content is 40%-60%, the carbon-nitrogen ratio (C/N) is 7.5-12.5, and the added amount is 10-25% of the sludge mass; The bacterial liquid is the earthworm filtrate collected from the filtrate collection tube.

The addition of conditioner is used to adjust the moisture content, porosity and palatability of the sludge to earthworms, which is a necessary step in the pretreatment. Crushing straw can provide more attachment surfaces for earthworms, increase oxygen content and improve sludge structure, which is more conducive to earthworms feeding sludge. The material structure of vermicompost and the type of microbial population it contains are the favorite and most suitable for the survival of earthworms. Therefore, choosing to reuse part of the vermicompost as a conditioning agent can improve the palatability of the sludge, reduce the adaptation time of the earthworms in contact with the sludge, and reduce the The toxic substances in the sludge damage the earthworms, thereby improving the treatment efficiency and reducing the mortality of earthworms.

The earthworm filtrate collected during the vermicomposting process contains a large amount of nutrients and microbial populations. The earthworm filtrate produced during the collection and treatment process replaces the traditional inoculum for earthworm fermentation and decomposing not only faster, but also the decomposed sludge is more palatable to earthworms. , which can reduce the contact adaptation time of earthworms and improve the efficiency of earthworm treatment, and at the same time, it can also save the cost of inoculants.

In step (3), the thickness of the decomposed sludge is 3-10cm. The thickness of the mud laying should not be too thick or too thin. Too thick mud laying will block the air and reduce the oxygen content in the compost box and thus affect the treatment efficiency; Supplement sludge and reduce overall treatment efficiency.

In step (4), the aeration adopts the mode of intermittent aeration, the aeration volume is 0.03-0.15L/Min, and the aeration is stopped for 3 hours after 30 minutes of aeration. Interstitial aeration can reduce the impact of aeration on earthworm activity to the greatest extent while supplementing the oxygen in the compost bin.

Beneficial effects:

1. The frame composite structure of the present invention has reasonable structure, small footprint (100t/d treatment scale covers an area of only 800m ² , which is dozens of times less than the traditional field culture mode), simple operation, construction cost and disposal The cost is much lower than other sludge treatment processes. A large number of finished earthworms, high-quality vermicompost organic fertilizers and earthworm filtrates are produced; the adaptability is wide, and the economic, environmental and social benefits are good.

2. The method adopted in the present invention has a short sludge treatment period, and the sludge treatment period can be shortened to 3-5 days, which is 1/5-1/10 of the time required by the traditional earthworm treatment method. In addition, a single feeding of earthworms can continuously process 20 batches or more of sludge, saving a lot of manpower and material resources. At the same time, the collection of vermicompost, earthworm filtrate and finished earthworms is more convenient, and it can also effectively avoid the problem of odor diffusion and mosquito breeding during the sludge treatment process by earthworms.

Description of drawings

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the above-mentioned and/or other aspects of the present invention will become clearer.

FIG. 1 is a schematic diagram of the overall structure of the frame composite structure earthworm reactor of the present invention.

FIG. 2 is a schematic structural diagram of each reactor box of the present invention.

Among them, each reference sign represents: 1 main frame; 2 bottom plate; 3 reactor box; 31 main box; 32 isolation filter layer; 33 sand supplement layer; 34 earthworm habitat layer; 35 nutrition supplement layer; 36 treatment Sludge layer; 37 baffles; 38 slide rails; 39 screws; 4 aeration pipes; 5 filtrate collection pipes; 6 aeration supply pipes; 7 filtrate concentration pipes;

Detailed ways

The present invention can be better understood from the following examples.

The structures, proportions, sizes, etc. shown in the drawings in the description are only used to cooperate with the contents disclosed in the description, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention. The technical substantive significance, any modification of the structure, the change of the proportional relationship or the adjustment of the size, should still fall within the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. within the range that can be covered. Meanwhile, terms such as "upper", "lower", "front", "rear" and "middle" quoted in this specification are only for the convenience of description and clarity, and are not used to limit the scope of the present invention. , the change or adjustment of the relative relationship, without substantial change of the technical content, should also be regarded as the scope of the present invention.

Example 1

The present invention adopts the frame composite structure earthworm reactor as shown in Fig. 1 for sludge treatment. The frame composite structure earthworm reactor includes a main frame 1 and a multi-layer reactor box 3 located in the main frame 1; the bottom of each layer of the main frame 1 is provided with a bottom plate 2, and the bottom of the main frame 1 is provided with a universal wheel 8; The reactor box 3 is movably arranged on the bottom plate 2 of each layer, and can be drawn out from the main frame 1 . The main frame 1 is 52cm long, 44cm wide and 230cm high, with a total of 15 layers, each layer is 15cm high. The main frame 1 can carry 15 reactor boxes 3 (standardized vermicompost boxes), covering an area of about 0.23m ² .

Each layer of the reactor box 3 is provided with an aeration pipe 4 and a filtrate collection pipe 5; one side of the main frame 1 is respectively provided with an aeration supply pipe 6 connected to the aeration pipes 4 of each layer, and a gas supply pipe 6 connected to each layer of filtrate. The collecting pipe 5 is connected to the filtrate concentration pipe 7; the aeration air supply pipe 6 is connected to an external aeration device, and the bottom of the filtrate concentration pipe 7 is connected to an external liquid storage tank to collect the earthworm filtrate generated during the treatment process. The aeration pipes 4 of each layer are all located in the earthworm habitat layer 34, and one end of the aeration pipes 4 located on the outside of the main box 31 is connected to the aeration supply pipe 6; , the temperature, humidity, oxygen content and other conditions in the box are controlled by aeration;

As shown in FIG. 2 , the reactor box 3 includes a main box 31 with an open top, and an isolation filter layer 32, a sand supplement layer 33, an earthworm habitat layer 34, Nutrient supplement layer 35 and treatment sludge layer 36 . The main box 31 is 12 cm high, 50 cm long and 40 cm wide. The isolation filter layer was filled with crushed straw with a thickness of 2 cm. The sand supplementary layer was filled with fine sand with a thickness of 0.5 cm. The worm habitat layer was filled with worm dung with a thickness of 6 cm, which was produced by mixing worm compost with cow dung and straw. The nutrient supplement layer consists of decomposed cow dung and perishable garbage with a thickness of 1 cm.

The main box 31 is located on both sides of the treated sludge layer 36 and is a baffle 37 that can slide up and down. The inner walls of the main box 31 on both sides of the main box 31 are provided with corresponding slide rails 38, and the baffle 37 extends up and down in the direction of the slide rail 38. Sliding; the bottom of the slide rail 38 is sealed, and the outer walls of the main box 31 are provided with screws 39 for fixing the baffle 37; 37 contact and fix the baffle 37; after a processing cycle is completed, the baffle is lowered to complete the reclaiming process, and the baffle is raised to complete the feeding process. Between the nutrient supplement layer 35 and the treated sludge layer 36, there is an isolation plate with holes. During the reclaiming process, the treated sludge on the isolation plate is directly scraped out. The isolation plate has holes to facilitate the movement of earthworms up and down.

The above-mentioned frame composite structure earthworm reactor is used to treat municipal sludge in a certain place. The specific steps are: put 2kg of adult ringed worms into the earthworm habitat bed in each standardized vermicompost box, and place it in a dark place at 18-28℃. It was cultured for 3 days under the conditions, during which water was sprayed on the surface of the earthworm habitat bed every day to maintain humidity. The municipal sludge with a moisture content of 87% is added with conditioners to pulverize the straw and vermicompost, and the addition amount is 5% and 15% of the weight of the sludge to be treated, respectively, and then put into the bacterial liquid processed by the worm leachate, mixed evenly, and then decomposed 24 Hour. The decomposed sludge was evenly spread on the earthworm habitat bed in the standardized vermicompost box, and the thickness of the mud was 5cm. Put all the standardized vermicompost boxes into the main frame and connect the aeration air supply pipe and the filtrate concentration pipe, turn on the aeration switch to start aeration, and carry out a cycle of sludge treatment. After 4 days, all the sludge in the standardized vermicomposting box has been converted into vermicompost, take out the standardized vermicomposting box, and lower the baffles on both sides of the standardized vermicomposting box to scrape and collect the treated sludge through the reclaiming window. After raising the baffle to add new sludge to be treated, put the standardized vermicompost box back into the main frame and connect the pipeline to start the next cycle of sludge treatment. The scraped and treated sludge is screened to separate the vermicompost from the finished worms. The separated vermicompost is reused as a new conditioner, and the remaining vermicompost and finished worms are stored as products in a centralized manner.

After testing 7 sludge treatment cycles in total, it is found that the time required for a single treatment cycle is basically stable at 3-4 days when the thickness of the sludge is 5 cm. After all the sludge was converted into vermicompost, the volume decreased by 32.7%-40.8%. The moisture content decreased from 87% to 61%, and the organic matter content decreased from 45.1% to 38.6%. The mass of sludge added in each cycle is 100kg, and 46.5kg-56.3kg of vermicompost can be collected. The total mass of vermicompost produced in seven cycles is 47% of the quality of the input sludge, and 23kg of earthworms of various sizes are collected, of which the received adult Earthworm 6.7kg. 1.3 L of earthworm filtrate was collected.

The vermicompost obtained in this example, the pure sludge after air-drying and grinding, and paddy field soil were used as culture substrates for potted research of pakchoi. The pure sludge in the soil phase will inhibit the growth of pakchoi to a certain extent, and may lead to the accumulation of heavy metals in its body. The vermicompost increases the above-ground yield of pakchoi by 132.4% respectively, and there is no obvious accumulation of heavy metals. The vermicompost treated by the method described in the present invention can be used as a culture medium for plant growth.

Example 2

The adopted frame composite structure earthworm reactor is the same as that of Example 1. Using the above-mentioned frame composite structure earthworm reactor to treat municipal sludge in a certain place, the specific steps are:

Put 2 kg of adult worms with rings into the worm habitat bed in each standardized vermicompost box, and culture them for 3 days at 18-28°C in the dark. During this period, water is sprayed on the surface of the worm habitat bed every day to maintain humidity. A total of 4 parts of municipal sludge with a moisture content of 87% were added to the conditioners A crushed straw and vermicompost, B crushed straw and cow dung, C crushed straw and perishable garbage, D crushed straw and cyanobacteria, and the amount added is the weight of the sludge to be treated. 5% and 15% of wormwood, and then put into the bacterial solution made by the earthworm leachate, mixed evenly, and then decomposed for 24 hours. The decomposed sludge was evenly spread on the earthworm habitat beds in 4 groups of standardized vermicompost boxes, and the thickness of the mud was 5 cm. Put all the standardized vermicompost boxes into the main frame and connect the aeration air supply pipe and the filtrate concentration pipe, turn on the aeration switch to start aeration, and carry out a cycle of sludge treatment. The sludge in the standardized vermicomposting box has been converted into vermicompost, take out the standardized vermicomposting box, lower the baffles on both sides of the standardized vermicomposting box, scrape and collect the treated sludge through the reclaiming window. After raising the baffle to add new sludge to be treated, put the standardized vermicompost box back into the main frame and connect the pipeline to start the next cycle of sludge treatment.

When the thickness of the mud is 5cm, the time required for a single treatment cycle of sludge conditioning is basically 9-13 days, and a single cycle of single standardized vermicompost The number of worm cocoons harvested in the box was 2, the weight of harvested earthworms was 0.21, and the average weight was 2.58 g.

The time required for a single treatment cycle of sludge conditioning using B crushed straw and cow dung as conditioners is basically 7-9 days. The number of worm cocoons harvested in a single standardized vermicompost box in a single cycle is 21, the harvested worm mass is 0.17, and the average mass is 1.64 g.

Using A crushed straw and vermicompost as conditioners, the time required for a single treatment cycle of sludge conditioning is basically 3-4 days. The number of worm cocoons harvested in a single standardized vermicompost box in a single cycle is 18, the harvested worm mass is 0.36kg, and the average worm mass is 3.62 g.

After comparison, it is concluded that using crushed straw and vermicompost as conditioners can greatly improve the efficiency of earthworm treatment of sludge and shorten the treatment period. Larger size accounts for more, which can produce greater economic benefits.

The present invention provides a framework composite structure earthworm reactor and the idea and method of the method for treating sludge. There are many specific methods and approaches to realize the technical solution. The above are only the preferred embodiments of the present invention. It should be pointed out that, For those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims (10)

1. The earthworm reactor with the frame composite structure is characterized by comprising a main body frame (1) and a multilayer reactor box body (3) positioned in the main body frame (1); the bottom of each layer of the main body frame (1) is provided with a bottom plate (2), and the reactor box body (3) is movably arranged on the bottom plate (2) of each layer and can be drawn out from the main body frame (1);

an aeration pipe (4) and a filtrate collecting pipe (5) are arranged in the reactor box body (3) of each layer; an aeration air supply pipe (6) connected with each layer of aeration pipe (4) and a filtrate concentration pipe (7) connected with each layer of filtrate collection pipe (5) are respectively arranged on one side of the main body frame (1); the aeration air supply pipe (6) is connected to an external aeration device, and the bottom of the filtrate concentration pipe (7) is connected with an external liquid storage tank.

2. The earthworm reactor with a frame composite structure according to claim 1, wherein the reactor tank (3) comprises a main tank (31) with an open top, and an isolation filter layer (32), a sand supplement layer (33), an earthworm inhabitation layer (34), a nutrition supplement layer (35) and a sludge treatment layer (36) which are respectively laid in the main tank (31) from bottom to top; the aeration pipes (4) of each layer of reactor box body are all positioned in the earthworm inhabiting layer (34), and one end of each aeration pipe positioned at the outer side of the main box body (31) is connected with the aeration gas supply pipe (6); the wall of the aeration pipe (4) positioned in the main box body (31) is provided with a vent hole; the filtrate collecting pipes (5) of all layers are positioned on the outer wall of the bottom of the isolation and filtration layer (32).

3. The earthworm reactor with a frame composite structure according to claim 2, wherein the main tank body (31) is provided with baffles (37) capable of sliding up and down on two sides of a processed sludge layer (36), and corresponding slide rails (38) are arranged on the inner walls of the lower part of the main tank body (31) on two sides; the bottom of the sliding rail (38) is sealed, and the outer walls of two sides of the main box body (31) are provided with screws (39) for fixing the baffle (37); and the screws (39) penetrate through the outer wall of the main box body (31) to contact with the baffle (37) in the slide rail (38) after being screwed down and fix the baffle (37).

4. The earthworm reactor with a frame composite structure according to claim 3, wherein a perforated partition plate is arranged between the nutrition supplementing layer (35) and the processed sludge layer (36), the diameter of the perforated partition plate is 1.5-4.5cm, and the number of the perforated partition plate is 25-85.

5. The earthworm reactor with a frame composite structure according to claim 2, wherein the main tank body (31) has a height of 15-25 cm, a length of 30-70 cm and a width of 20-60 cm;

the isolation filter layer (32) is filled with crushed straws with the thickness of 0.5-2 cm, the sand supplement layer (33) is filled with fine sand with the thickness of 0.5-1.5 cm and the fineness modulus is 2.2 ~ 1.6.6, the earthworm habitat layer (34) is filled with earthworm cast with the thickness of 5-9 cm, the nutrition supplement layer (35) is filled with decomposed cow cast and perishable garbage with the thickness of 0.5-2 cm, and the treated sludge layer (36) is used for adding sludge to be treated and laid with the thickness of 3-10 cm.

6. The earthworm reactor with the frame composite structure as claimed in claim 1, wherein the main body frame (1) is 250 cm high, 32-72 cm long and 22-62 cm wide, and is divided into 5-20 layers, each layer carries one reactor box (3), and each layer is 18-30 cm high.

7. The method for treating sludge by using the earthworm reactor with the frame composite structure as claimed in claim 1, which is characterized by comprising the following steps:

(1) putting 1.2-4.5kg of adult Eisenia foetida with a belt into the earthworm habitat bed in each reactor box body (3), culturing for 2-7 days at 18-28 ℃ in a dark place, and spraying water into the reactor box body (3) every day to keep the water content of the earthworm habitat bed at 60-80 wt%;

(2) adding a conditioner into the sludge in the sludge storage tank, adding bacterial liquid, uniformly mixing, and decomposing for 12-48 hours;

(3) uniformly paving the thoroughly decomposed sludge obtained in the step (2) on earthworm perching beds in the reactor boxes (3) after the culture in the step (1) is finished;

(4) each reactor box body (3) is respectively placed in the main body frame (1) and is sequentially communicated with an aeration gas supply pipe (6) and a filtrate concentration pipe (7); starting aeration to perform sludge treatment for one period;

(5) after the sludge in each reactor box body (3) is completely converted into wormcast, taking out each reactor box body (3), scraping and collecting the sludge treated in each reactor box body (3) and the surface layer earthworms, and supplementing the sludge to be treated for treating the sludge in the next period;

(6) and scraping the collected treatment product, separating wormcast and finished earthworms by using a screen, recycling a part of the separated wormcast as a new conditioner, and storing the rest wormcast and finished earthworms as products in a centralized manner.

8. The method for treating sludge according to claim 7, further comprising the step (7): after 20 continuous treatment cycles are finished, 0.1-0.35 kg of rejuvenated earthworms are added into each reactor box body (3).

9. The method for treating sludge according to claim 7, wherein in the step (2), the sludge is municipal sludge with a water content of 75-90 wt%; the conditioner is a mixture of crushed straws and wormcast, the adding amount of the crushed straws is 3-7% of the mass of the sludge, the wormcast is the wormcast obtained in the step (6), the water content is 40% -60%, the carbon-nitrogen ratio is 7.5-12.5, and the adding amount of the wormcast is 8-35% of the mass of the sludge; the bacteria liquid is earthworm filtrate collected from a filtrate collecting pipe.

10. The method for treating sludge according to claim 7, wherein in the step (4), aeration is performed by intermittent aeration at an aeration rate of 0.03 to 0.15L/Min, and aeration is stopped for 3 hours per 30 minutes of aeration; one cycle of sludge treatment is 3-5 days.

Images